package com.graduate.utils;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;


/**
 * @description: http调用相关工具包
 * @author: JingChu
 * @createtime :2021-06-06 09:04:48
 **/
public class HttpUtils {


    protected Logger logger = LoggerFactory.getLogger(this.getClass());
    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url   发送请求的URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                logger.error("------------------->INFO:  " + key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error("------------------->INFO:  " + "发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            logger.error("------------------->INFO:  " + "发送 POST 请求出现异常！" + e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url  发送请求的 URL
     * @param body 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public String httpPost(String url, String body) throws Exception {


        // 服务端通常是根据请求头（headers）中的 Content-Type 字段来获知请求中的消息主体是用何种方式编码，再对主体进行解析。所以说到 POST 提交数据方案，包含了 Content-Type 和消息主体编码方式两部分
        HttpClient client = new HttpClient() ; // 客户端实例化
        PostMethod postMethod = new PostMethod(url); // 请求方法post，可以将请求路径传入构造参数中
        postMethod.addRequestHeader("Content-type", "application/json; charset=utf-8");

        byte[] requestBytes = body.getBytes("utf-8"); // 将参数转为二进制流
        InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,
                requestBytes.length);
        RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
                requestBytes.length, "application/json; charset=utf-8"); // 请求体
        postMethod.setRequestEntity(requestEntity);   // 将参数放入请求体

        int i = client.executeMethod(postMethod);  // 执行方法
        System.out.println("请求状态" + i);
        // 这里因该有判断的，根据请求状态判断请求是否成功，然后根据第三方接口返回的数据格式，解析出我们需要的数据

        byte[] responseBody = postMethod.getResponseBody(); // 得到相应数据
        String s = new String(responseBody);
        return s;
    }


    public String doPost(String url, Map params) {
        BufferedReader in = null;
        try {
            // 定义 HttpClient
            org.apache.http.client.HttpClient client = new DefaultHttpClient();
            // 实例化 HTTP 方法
            HttpPost request = new HttpPost();
            request.setURI(new URI(url));
            //设置参数
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            for (Iterator iter = params.keySet().iterator(); iter.hasNext(); ) {
                String name = (String) iter.next();
                String value = String.valueOf(params.get(name));
                nvps.add(new BasicNameValuePair(name, value));
                //System.out.println(name +"-"+value);
            }
            request.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
            HttpResponse response = client.execute(request);
            int code = response.getStatusLine().getStatusCode();
            if (code == 200) { //请求成功
                in = new BufferedReader(new InputStreamReader(response.getEntity()
                        .getContent(), "utf-8"));
                StringBuffer sb = new StringBuffer("");
                String line = "";
                String NL = System.getProperty("line.separator");
                while ((line = in.readLine()) != null) {
                    sb.append(line + NL);
                }
                in.close();
                return sb.toString();
            } else { //
                System.out.println("状态码：" + code);
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}
